Hydraulic system



G. S ALLIN Jan. 31, 1939.

HYDRAULI C SYSTEM Filed Oct. 6, 1957 INVENTOR GEOEGE S. 14mm! 25 withthe hydraulic circuit and by reason of the slots Ill-l, which, openrespectively into sumps 25 whereinwill be, in effect, a wiping action ofthe lower edge 55 Patented Jan. 31, 1939 r 2,145,384

UNITED STATES PATENTOFIFICE 2,145,384 mrmmuuc SYSTEM George S. Allin,Seattle, Wash. Application October 6, 1937, Serial No. 167,595 2 Claims.(Cl. 121-1) This invention relates to improvements in hy- Fig. 1 is alongitudinal, sectional view of a hydraulic jacks, hydraulic hoists andother hydraudraulic cylinder. having cylinder sumps in accordlic powersystems employing metal cylinders in ance with the present invention.

which metal pistons are fitted for reciprocal Fig. 2 is a. crosssectional detail on the line 5 travel under the force of a hydraulicpressure 2--2 in Fig. 1. v 5

medium or where the piston operates to eflect Referring more in detailto the drawingpressure through the hydraulic medium; such I designates ahydraulic cylinder having its opjacks, or hoists, being used extensivelyat the posite ends closed by the cylinder heads 2 and present time inroad building and dirt hauling 3, which may be permanently secured tothe cyl- 1o equipment, as will be disclosed by reference to inder eitherby the welding, as indicated at d, or Patent No. 2,072,998, issued to meMarch 9, 1937, by any other suitable means. The cylinder is and to theapplication filed by me under Serial fitted with a piston 5 havingencircling grooves No. 76,594 on April 2'7, 1936, although it is under-5a. fitted with packing rings 5b of the convenstood that it is not to beconfined to such equiptional form. Connected with the piston is apisment. ton rod 6 which extends through a, packing gland l5 Explanatoryto the present invention, it will I in the cylinder head 2. The cylinderhead 3 is here be stated that it is the case, especially when equippedwith a mounting lug 8, and the rod 6, at the hydraulic cylinders arehorizontally disposed,. its outer end, is equipped with a cross head orthat the cylinder walls will become scored along bearing 9, whereby itmay be attached to operthe lower-side by reason of foreign matter, suchating part to be operated by, or which may actu- 20 as metal chips,shavings, or filings being picked ate the piston. up between the pistonand cylinderwall. This As was previously mentioned, the cylinder lforeign matter may come from the pipes, tanks, is disposed horizontally,and .is provided in its castings or other parts of the system in contactlower side wall, at, the opposlte'endawith cross circulation of thehydraulic medium; will ultiii and Ii, formed inhousings i2 and it, thatmately find its'way into the "cylinder, and, by may be welded to orformed integral with the reason of the reciprocal action of the piston,will 'cylinder body. Each sump is provided with a work its way into thejoint between the piston drainage or clean-out opening, and a plug itand cylinder walls, with the result that the cylis removably threadedinto the opening. 0 inder walls become scored. This scoring ofthe Onefeature of this invention resides in the cylinder wall is detrimental tothe operation of fact that the cross slots Ill are so located that thedevice, as will be understood by those familiar the opposite edges oi.the piston will, as the piswith the art,- it is damaging to theequipment, and ton moves to its opposite limits of travel, overlap anyleakage materially reduces its efiiciency, espetherewith to the extentindicated in Fig. 1. cially when high pressures are to beheld by thePipes l8 and I9 connect with the opposite ends piston. oi! the cylinderthrough the cylinder heads 2 and In view of the above, it has been theprincipal 3, and when a hydraulic medium is used to actuobject of thisinvention to provide a cylinder ate the piston, any suitable means, pumpor the 40 construction that will overcome the destructive like, notherein shown, maybe utilized for efiect: 40 and detrimental effects ofany foreign matter that 'ing the delivery of the liquid pressure mediummay collect in the cylinder. 1 through the pipes into the cylinder.

. It is a further object of this invention to provide Assuming that thedevice is so constructed and the cylinders in such use with sumps forthe assuming also that the pressure medium is adcollection or suchmaterial and to provide for mitted into and from the opposite ends ofthe 45 its removal from the sumps. cylinder in accordance with anynecessary mode' Still further objects of the invention reside in ofopera io whereby the piston will c p the details of construction of-thesumps and the al y c u d en e limits of vel i direlationship t t li t oftr of th pigcated by the full line position and the dotted line t in thyn d position, it will then be quite apparent that any 50 Inaccomplishing these and other objects of foreign Substance, Such as ametal chip, vi g the invention, Ihave provided the improved deor thelike, on entering the cylinder, will settle tails of construction, thepreferred forms of which to the bottom and will be pushed by the pi tare illustrated in the accompanying drawing, in its reciprocal action,into the sumps. There portions of the slots into the sumps and thiswilloperate to remove any of the foreign matter that would other wisecling to the piston edge. In view of the fact that the foreign materialdoes not have the opportunity of entering the joint between the pistonand cylinder wall, the detrimental scoring effect will not take place.

While I have described the invention in connection with hydrauliccylinders disposed horizontally, it is to be understood that this hasreference to cylinders in any position that would permit foreign matterto settle against the bottom wall of the cylinder, as distinguished fromsettling against a cylinder head. The cylinder may be horizontal, or itmay be inclined to a substantial degree between horizontal and verticalpositions, and still-can employ sumps of this character to advantage.

1 Cylinders are in use at the present time which have very effectivelydemonstrated the practicability and utility of this construction for itis quite readily apparent that, periodically, the sump may be cleaned ofdebris, and if this is done before the sumps fill up, there will be nooccasion for any damage being done to the cylinder walls or piston byreason of'the collection of foreign matter in the system.

2,145,384 piston across the edges of the The construction, whileapplicable particularly to hydraulic jacks and hoists,-may be utilizedin cylinders for various other purposes with the same advantageousresults. Therefore, it'is the intent that the claims be given aninterpretation that is commensurate with the invention disclosed.

Having thus described my invention, what I claim as new therein anddesire to secure by Letters Patent is- 1. In a hydraulic system, ahydraulic cylinder and a piston reciprocally movable therein, saidcylinder'having cross slots in its bottom wall at the opposite limits oftravel of the piston, housings fixed to the cylinder and forming closedsumps to receive sediment passing through the slots.

2. In a hydraulic system, a hydraulic cylinder and a piston reciprocallymovable therein; said cylinder'having cross slots in its bottom wall atthe opposite limits of travel of the piston, housings fixed to thecylinder and forming closed sumps to receive sediment passing throughthe slots, and said sumps having clean out ports and plugs removablythreaded into the ports.

GEORGE S. ALLDI.

